There's also an alternative DOS emulator for PPC, handheld PC's, etc:
PocketDOS is a very polished product that emulates a 80186 processor out of the box (but can still run a lot of software that was compiled for all processor types). There are also 386/486 processor plugins available that improve the quality of emulation and let you run a large software selection.
It's shareware as opposed to Dosbox which is freeware, but is also well supported and is under constant improvement.